I trying to run a multi objective optimization problem with Gamultibj, I got that error, Can anyone help me 

options = optimoptions(@gamultiobj,'PlotFcn',@gaplotpareto);

[x,Fval,exitFlag,Output] = gamultiobj(@functionmulti,nvars,A,b,Aeq,beq,lb,ub,options);

Error using optimoptions (line 114)

Invalid solver specified. Provide a solver name or handle (such as 'fmincon' or @fminunc).

Type DOC OPTIMOPTIONS for a list of solvers.

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